classification, [73]

Trembley, on Turbellaria, [6];

on Polyzoa, [496], [497]

Trepostomata, [520]

Triaenophorus (= Tricuspidaria), [91];

excretory system, [84]

Triarthra, [201], [203], [206], [211], [224], [225], [226]

Triarthridae, [200], [201], [202], [206], [207], [224], [226]

Trias, Serpulid in, [301]

Trichina, [131], [135], [144], [161];